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  3. 3. compare and contrast megagametogenesis and embr

3. Compare and contrast megagametogenesis and embryo development in Pinus and angiosperms. You must use, but...

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Biology

3. Compare and contrast megagametogenesis and embryo developmentin Pinus and angiosperms. You must use, but are notlimited to, the following terms: functional megaspore, archegonia,eggs, free nuclear, suspensor, basal cell, developing embryo,megagametophyte, fertilization.

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Megagametogenesis is the process of formation of female gametophyte i.e., embryo sac from megaspores. The process involves -

  • Megaspores result from the meiotic division of the megaspore mother celll, megasporocyte.
  • The megasporocyte undergo meiotic division resulting in the formation of a linear tetrad of haploid megaspores.
  • Three of the four megaspores degenrates and one remain functional which lies towards chalza end
  • Megaspores give rise to the embryo sac, the female gametophyte.
  • the nuclei of megaspore undergo three mitotic division and gives an eight nucleated embryo sac.
  • The eight nucleate cell is arranged into the seven celled embryo sac.
  • The three cell at the micro
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